Pure Filters: Proof, not promises.

Coldstream FTO+ cartridges are designed to effectively reduce a wide range of contaminants, including bacteria, viruses, heavy metals, nitrates, fluoride, and pharmaceutical residues, while preserving the essential minerals naturally present in water.

We recommend replacing the cartridges every 6 months. Once the filter is put into service, the activated carbon remains effective for approximately 6 months. Activated carbon is extremely efficient at adsorbing a wide range of contaminants, but its pores gradually become saturated over time, which limits its service life.

We publish all test results in full, based on realistic and relevant filtration volumes for everyday use. This dual commitment—comprehensive contaminant coverage and complete transparency regarding raw test data—positions Coldstream as one of the most rigorous and transparent brands in the gravity-fed water filtration market.

Unlike many low-cost alternatives, we provide full traceability, verifiable scientific data, and performance testing up to 3,000 litres by an independent laboratory using NSF/EPA testing protocols. Choosing a European-made filter means trusting a tradition of excellence and ensuring the safety of your drinking water.